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Share-Based Compensation (Share-based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received from option exercises | $ 6,247 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | $ 1,446 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | $ 2,492 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Share-based compensation expense | (4,112)us-gaap_ShareBasedCompensation | (974)us-gaap_ShareBasedCompensation | (370)us-gaap_ShareBasedCompensation
Tax benefit on sales of incentive stock options | 148 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 202 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 86 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Common Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | (142)us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (125)us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (168)us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Tax benefit on sales of incentive stock options | $ 148 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 202 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 86 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Details
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- Details
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